Display Driver Single-Wire DC-DC Converter Control
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Solution Overview
Problem
Existing display devices face inefficiencies in power management, particularly in generating and controlling multiple power voltages for pixels, which can lead to increased complexity and power consumption due to the need for multiple connecting lines between the display panel driver and the DC-DC converter.
Innovation Solution
A display device and electronic device configuration that includes a display panel driver dividing a frame into pulse periods to generate an analog supply voltage, a first power voltage, and a second power voltage, with a DC-DC converter receiving control signals through a single wire, enabling the generation and control of these voltages based on pulse numbers during specific periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple connecting lines are used between the display panel driver and DC-DC converter to transmit control signals for generating multiple power voltages, then the control precision and reliability are improved, but the device complexity and power consumption increase
Solution Approach 1:
The patent combines multiple control signals (first control signal for first power voltage, second control signal for second power voltage, and third control signal for analog supply voltage) into a single composite control signal transmitted through one connecting line. The display panel driver generates this unified control signal that contains timing information for all three voltage generations, thereby reducing the number of connecting lines from three to one while maintaining reliable control of all DC-DC converter functions.
Solution Approach 2:
The single connecting line between the display panel driver and DC-DC converter serves multiple functions: it transmits the control signal for analog supply voltage generation, the control signal for first power voltage generation, and the control signal for second power voltage generation. This multi-functional use of a single communication channel reduces system complexity while maintaining full control capability over all power voltage generation processes.
2Measurement precision
If multiple connecting lines are used between the display panel driver and DC-DC converter, then the control precision is improved, but the power consumption increases
Solution Approach 1:
The patent merges multiple control signal transmissions into a single composite control signal that is transmitted through one connecting line. This reduces the total number of signal lines required, thereby reducing the overall power consumption associated with signal transmission while maintaining precise control timing for all power voltage generation functions through the unified signal protocol.
3Device complexity
If the DC-DC converter receives control signals through a single wire, then the device complexity is reduced, but the control precision may deteriorate
Solution Approach 1:
The single composite control signal is segmented into distinct timing portions within its structure: a first control signal portion for first power voltage generation, a second control signal portion for second power voltage generation, and a third control signal portion for analog supply voltage generation. This segmentation allows the single wire to carry multiple differentiated control instructions with precise timing information, maintaining control precision while reducing physical line count.
Solution Approach 2:
The control signal transmitted through the single wire operates in a periodic time-division manner, with different control signal portions transmitted at different time intervals corresponding to different pulse periods. This periodic transmission structure ensures that each control function receives precise timing information while sharing the same communication channel, thereby maintaining control precision without requiring separate dedicated lines for each function.
Data Source
AI summary
A display device includes a display panel driver and a DC-DC converter. The display panel driver divides one frame into a plurality of periods and outputs a control signal to generate an analog supply voltage, a first power voltage, and a second power voltage for driving pixels. The DC-DC converter receives the control signal from the display panel driver through a single wire. The DC-DC converter includes an analog supply voltage generator, a first power voltage generator, and a second power voltage generator. The analog supply voltage generator generates the analog supply voltage during a first pulse period. The first power voltage generator generates the first power voltage during a second pulse period. The second power voltage generator generates the second power voltage during the third pulse period.